Most portfolios in the federal government’s 401(k)-style retirement savings program saw modest gains last month, building on a strong July showing.

Leading the pack in August was the Thrift Savings Plan’s S Fund, which gained 4.57 percent. Since January the portfolio, invested in small- and mid-size businesses, has grown 12.84 percent.

The common stocks of the C Fund increased 3.26 percent last month, bringing its 2018 total gains to 9.91 percent. The fixed income bonds in the F Fund increased 0.67 percent in August, although it still is 0.86 percent in the red for the year so far.

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The G Fund, which is made up of government securities, grew 0.26 percent in August. So far in 2018, that portfolio has increased 1.88 percent.

The international stocks in the I Fund were the only TSP offering in the red last month, dropping 1.91 percent. Since January, the fund has lost 1.95 percent.

All of the lifecycle (L) funds, which shift investments toward more stable portfolios as participants get closer to retirement, grew in August. The L Income Fund, designed for people who have already begun monthly withdrawals, increased 0.61 percent. The L 2020 fund grew 0.80 percent; L 2030, 1.28 percent; L 2040, 1.47 percent; and L 2050, 1.65 percent.

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